You dont need doc/view architecture, here is a simple solution.
1) In your dialog header file add:
CDHtmlDialog m_HtmCtrl;
2) Place a picture control on your dialog.
3) In your dialog OnInit function add:
VERIFY(m_HtmCtrl.SubclassDlgItem(IDC_PICTURE_CTRL, this));
m_HtmCtrl.OnInitDialog();
m_HtmCtrl.Navigate(_T("SomePage.htm"));
4) You probably already have this but make sure the following include is in your stdafx file:
#include <afxdhtml.h>